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From "Manukranth Kolloju (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-12075) Preemptive Fast Fail
Date Thu, 09 Oct 2014 23:35:36 GMT

     [ https://issues.apache.org/jira/browse/HBASE-12075?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Manukranth Kolloju updated HBASE-12075:
    Attachment: 0001-HBASE-12075-Implement-Preemptive-Fast-Fail.patch

Added another test that covers more cases within hbase-client. Also, made sure that almost
the entire file is covered just within the hbase-client tests. 

> Preemptive Fast Fail
> --------------------
>                 Key: HBASE-12075
>                 URL: https://issues.apache.org/jira/browse/HBASE-12075
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Client
>    Affects Versions: 0.99.0, 2.0.0,
>            Reporter: Manukranth Kolloju
>            Assignee: Manukranth Kolloju
>         Attachments: 0001-Add-a-test-case-for-Preemptive-Fast-Fail.patch, 0001-HBASE-12075-Implement-Preemptive-Fast-Fail.patch,
0001-HBASE-12075-Implement-Preemptive-Fast-Fail.patch, 0001-HBASE-12075-Implement-Preemptive-Fast-Fail.patch,
0001-Implement-Preemptive-Fast-Fail.patch, 0001-Implement-Preemptive-Fast-Fail.patch, 0001-Implement-Preemptive-Fast-Fail.patch,
0001-Implement-Preemptive-Fast-Fail.patch, 0001-Implement-Preemptive-Fast-Fail.patch
> In multi threaded clients, we use a feature developed on 0.89-fb branch called Preemptive
Fast Fail. This allows the client threads which would potentially fail, fail fast. The idea
behind this feature is that we allow, among the hundreds of client threads, one thread to
try and establish connection with the regionserver and if that succeeds, we mark it as a live
node again. Meanwhile, other threads which are trying to establish connection to the same
server would ideally go into the timeouts which is effectively unfruitful. We can in those
cases return appropriate exceptions to those clients instead of letting them retry.

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